Method 1 Edit file /etc/sysctl.conf, vi /etc/sysctl.conf Add the following lines: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 If you want to disable IPV6 for particular network card, for example enp0s3, add the following entry. net.ipv6.conf.enp0s3.disable_ipv6 = 1 Save and exit the file. Execute the following command to reflect the changes. sysctl -p Method 2: To IPv6 disable… Continue reading How To Disable IPv6 In CentOS 7